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1.
Parasitol Res ; 119(1): 267-281, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31760500

RESUMO

Coccidia (Chromista: Miozoa: Eimeriidae) of columbiform birds (Aves: Columbiformes) have been described since the end of the nineteenth century; however, some of these descriptions were poorly detailed or inconclusive. In this sense, the current work makes a detailed taxonomic revision reconsidering and organizing 18 Eimeria spp. and two Isospora spp. previously described or reported of Columbiformes. Along with this, a new species of Eimeria is morphologically and molecularly identified by the mitochondrial cytochrome c oxidase subunit 1 (COI) gene and by the 18S small subunit ribosomal RNA (18S) gene from the ruddy ground-dove Columbina talpacoti (Temminck, 1809) in the Médio Paraíba region of the State of Rio de Janeiro, southeastern Brazil. Eimeria columbinae n. sp. has subspheroidal oocysts, 14.7 × 13.2 µm, with smooth, bi-layered wall, ~ 1.1 µm and length/width ratio of 1.1. Micropyle and oocyst residuum are present, but polar granule is absent. Sporocysts are ellipsoidal to slightly asymmetrical, 9.0 × 5.1 µm, with both Stieda and sub-Stieda bodies. Sporocyst residuum present and sporozoites with refractile body and nucleus. This is the 19th description of an eimerian from Columbiformes in the World, and the second to have a molecular identification of the COI and 18S genes.


Assuntos
Doenças das Aves/parasitologia , Coccidiose/veterinária , Columbiformes/parasitologia , Eimeriidae/classificação , Animais , Doenças das Aves/epidemiologia , Brasil/epidemiologia , Coccidiose/epidemiologia , Coccidiose/parasitologia , Ciclo-Oxigenase 1/genética , Eimeriidae/citologia , Eimeriidae/genética , Eimeriidae/isolamento & purificação , Oocistos/citologia , Oocistos/isolamento & purificação , Proteínas de Protozoários/genética , RNA Ribossômico 18S/genética , Esporozoítos/citologia , Esporozoítos/isolamento & purificação
2.
J Avian Med Surg ; 33(1): 22-28, 2019 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-31124608

RESUMO

We determined the prevalence of Chlamydia psittaci genotypes in asymptomatic and symptomatic birds in northeast Iran. Samples were collected from 11 species of Psittaciformes and 1 species of Columbiformes from 2015 to 2016. Choanal cleft and cloacal swab samples, fresh fecal samples, and/or tissue samples of 70 symptomatic and 130 asymptomatic birds were collected and tested by molecular detection (nested polymerase chain reaction [PCR] testing specific for C psittaci). Results showed C psittaci was detected in 37 (18.5%) of 200 birds (18/37 symptomatic and 19/37 asymptomatic birds) by nested PCR assay. Of the PCR-positive samples, 14 products were positive for oligonucleotide sets CTU/CTL by a second PCR assay and genotyped by outer membrane protein A (ompA) gene sequencing. Of the 10 samples positive for genotype A (cockatiels [Nymphicus hollandicus, n = 5], ring-necked parakeet [Psittacula krameri, n = 2], African gray parrot [Psittacus erithacus, n = 3]), 6 samples were from asymptomatic and 4 from symptomatic birds. Genotype B was observed in 3 samples from symptomatic birds (P krameri [n = 2], pigeon [Columba livia, n = 1]), and provisional genotype I was detected in one symptomatic cockatiel. These findings revealed the importance of monitoring imported asymptomatic birds in developing countries, especially the Middle East, where there is no systematic monitoring. To the best of our knowledge, this is the first report regarding the detection of C psittaci provisional genotype I in cockatiels.


Assuntos
Doenças das Aves/microbiologia , Chlamydophila psittaci/classificação , Columbiformes , Genótipo , Psittaciformes , Psitacose/veterinária , Animais , Proteínas da Membrana Bacteriana Externa/genética , Sequência de Bases , Doenças das Aves/epidemiologia , Aves , Chlamydophila psittaci/genética , Columbiformes/microbiologia , Irã (Geográfico)/epidemiologia , Filogenia , Reação em Cadeia da Polimerase/veterinária , Psittaciformes/microbiologia , Psitacose/epidemiologia , Psitacose/microbiologia
3.
Acta Histochem ; 121(3): 354-360, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30826091

RESUMO

The spatial organization of cells during tissue differentiation is a crucial process in the morphogenesis of vertebrates. This process involves the movement, separation, and connection of cells. It is essential to elucidate the molecular mechanisms involved in these processes for the understanding of animal morphogenesis. Cell-cell adhesion molecules, called cadherins, are involved in the selective adhesion of cells. In the case of birds, the expression of these molecules in various organ systems during embryonic development has been reported in Gallus gallus domesticus. In this work, we present the immunohistochemical analysis of the differential expression of E and N-cadherin binding molecules in Columba livia embryos at various stages of gonadal morphogenesis. The expression of E and N-cadherin in embryos corresponding to the stages 41, 43 and in neonates of 2, 5, 7 and 75 post-hatching days were assessed by immunohistochemistry. Results revealed the expression of N-cadherin in the plasma membrane and the perinuclear zone of germline cells in ovaries and testes. However, the expression of E-cadherin was noticed with similar immunoreactivity pattern, in Sertoli cells and in the cells of the follicular nests. The differential expression of follicular cells and Sertoli cells positive for E-cadherin and germline cell N-cadherin positive cells were evidenced in the present work at the cell-cell interaction level. Future studies will focus on determining the expression of E and N-cadherin molecules during the migration of the primordial germ cells and the colonization of the genital ridge.


Assuntos
Caderinas/metabolismo , Galinhas/metabolismo , Morfogênese/fisiologia , Testículo/metabolismo , Animais , Columbiformes , Feminino , Imuno-Histoquímica/métodos , Masculino , Ovário/metabolismo , Células de Sertoli/citologia
5.
Syst Parasitol ; 95(8-9): 953-958, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30353298

RESUMO

Two new quill mite species of the genus Psittaciphilus Fain, Bochkov & Mironov, 2000 (Acariformes: Prostigmata: Syringophilidae) collected from columbiform birds (Columbiformes) are described: Psittaciphilus montanus n. sp. form the ruddy quail-dove Geotrygon montana Gosse from Trinidad and Tobago, Brazil and Panama, and Psittaciphilus patagioenas n. sp. from the band-tailed pigeon Patagioenas fasciata (Say) from Colombia and the scaled pigeon Patagioenas speciosa (Gmelin) from Surinam. A key to the species of the genus Psittaciphilus is provided. Our finding is the first record of the representatives of this genus on columbiform birds.


Assuntos
Columbiformes/parasitologia , Ácaros/classificação , Animais , Brasil , Colômbia , Ácaros/anatomia & histologia , Panamá , Especificidade da Espécie , Trinidad e Tobago
6.
Acta Histochem ; 120(5): 446-455, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29776745

RESUMO

In this work, testicular ontogeny is analyzed at the anatomical, histological and immunohistochemical levels; the latter through the detection of GnRHR and PCNA in the testicles of embryos, neonates and juveniles of Columba livia. We analyzed 150 embryos, 25 neonates and 5 juveniles by means of observations under a stereoscopic magnifying glass and scanning electron microscope (SEM). The histological analysis was performed using hematoxylin-eosin staining techniques and the PAS reaction. For the immunohistochemical analysis, the expression of GnRHR and PCNA in embryos corresponding to stages 41, 43 and in neonates of 2, 5, 7 and 75 days post-hatch was revealed in testicular histological preparations. That gonadal outline is evident in stage 18. In stage 29, the testes are constituted of a medulla in which the PGCs are surrounded by the Sertoli cells, constituting the seminiferous tubules. From stage 37 a greater organization of the tubules is visualized and at the time of hatching the testicle is constituted of the closed seminiferous tubules, formed of the PGCs and Sertoli cells. The Leydig cells are evident outside the tubules. In the juvenile stages, the differentiation of germline cells and the organization of small vessels that irrigate the developing testicle begin to be visible. In the analyzed stages, the immunodetection of the GnRHR receptor and PCNA revealed specific marking in the plasma membrane and in the perinuclear zone for GnRHR and in the nucleus of the germline cells in juvenile testicles for PCNA. These results can be used as a basis for further study of endocrine regulation events during testicular ontogeny in avian species.


Assuntos
Receptores LHRH/metabolismo , Testículo/crescimento & desenvolvimento , Animais , Columbiformes , Imuno-Histoquímica , Masculino , Antígeno Nuclear de Célula em Proliferação/metabolismo , Testículo/anatomia & histologia , Testículo/embriologia
7.
J Avian Med Surg ; 32(1): 19-24, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29698078

RESUMO

Coracoid fractures are a frequent presentation in wild birds, commonly caused by collisions with motor vehicles, windows, or other obstacles such as pylons. Despite this, there are few reports of outcomes, and those published consist of small numbers of birds with conflicting results when comparing conservative management with surgical intervention. To determine outcome success of conservative management in a larger population of wild birds, records of 232 adult wild birds in the United Kingdom (UK) with closed unilateral coracoid fractures confirmed on radiography and surviving more than 48 hours after admission were retrospectively analyzed. Conservative management had a high success rate, with 75% (n = 174/232; 95% confidence limits [CL]: 69%, 80%) of all birds successfully released back to the wild. The proportion of raptors successfully returned to the wild was even higher at 97% (n = 34/35; 95% CL: 85%, 99%). A significant difference of 26% (95% CL: 18%, 34%, Fisher exact test, P < .001) was demonstrated when comparing the outcome success of raptors (97%, n = 34/35) to nonraptors (71%, n = 140/198). The median time in captive care until released back to the wild was 30 days (95% CL: 27, 33). Conservative management of coracoid fractures in wild birds in the UK, and in particular in raptors, appears to result in good outcomes. The approach is low cost and noninvasive, in contrast to surgery, and is recommended as the first-line approach of choice in these cases.


Assuntos
Columbiformes/lesões , Processo Coracoide/lesões , Fraturas Ósseas/veterinária , Aves Predatórias/lesões , Aves Canoras/lesões , Animais , Animais Selvagens/lesões , Animais Selvagens/fisiologia , Columbiformes/fisiologia , Voo Animal/fisiologia , Fraturas Ósseas/reabilitação , Fraturas Ósseas/terapia , Aves Predatórias/fisiologia , Estudos Retrospectivos , Aves Canoras/fisiologia , Fatores de Tempo , Resultado do Tratamento , Reino Unido , Gravação em Vídeo
8.
PLoS One ; 13(3): e0194857, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29579092

RESUMO

Gut bacterial communities have been shown to be influenced by diet, host phylogeny and anatomy, but most of these studies have been done in captive animals. Here we compare the bacterial communities in the digestive tract of wild birds. We characterized the gizzard and intestinal microbiota among 8 wild Neotropical bird species, granivorous or frugivorous species of the orders Columbiformes and Passeriformes. We sequenced the V4 region of the 16S rRNA gene in 94 collected samples from 32 wild birds from 5 localities, and compared bacterial communities by foraging guild, organ, locality and bird taxonomy. 16S rRNA gene-based sequencing data were examined using QIIME with linear discriminant analysis effect size (LEfSe) and metabolic pathways were predicted using PICRUSt algorism. We identified 8 bacterial phyla, dominated by Firmicutes, Actinobacteria and Proteobacteria. Beta diversity analyses indicated significant separation of gut communities by bird orders (Columbiformes vs. Passerifomes) and between bird species (p<0.01). In lower intestine, PICRUSt shows a predominance of carbohydrate metabolism in granivorous birds and xenobiotics biodegradation pathways in frugivorous birds. Gizzard microbiota was significantly richer in granivorous, in relation to frugivorous birds (Chao 1; non-parametric t-test, p<0.05), suggesting a microbial gizzard function, beyond grinding food. The results suggest that the most important factor separating the bacterial community structure was bird taxonomy, followed by foraging guild. However, variation between localities is also likely to be important, but this could not been assessed with our study design.


Assuntos
Animais Selvagens/microbiologia , Columbiformes/microbiologia , Microbioma Gastrointestinal , Moela das Aves/patologia , Passeriformes/microbiologia , Gastropatias/patologia , Algoritmos , Animais , Bactérias/genética , Bactérias/isolamento & purificação , Biodiversidade , DNA Bacteriano/química , DNA Bacteriano/isolamento & purificação , DNA Bacteriano/metabolismo , Análise Discriminante , Moela das Aves/microbiologia , Intestinos/microbiologia , Análise de Componente Principal , RNA Ribossômico 16S/genética , RNA Ribossômico 16S/metabolismo , Análise de Sequência de DNA , Gastropatias/microbiologia , Gastropatias/veterinária
9.
J Parasitol ; 104(1): 106-108, 2018 02.
Artigo em Inglês | MEDLINE | ID: mdl-28967328

RESUMO

A molecular surveillance of haemosporidian parasites from 19,521 Culex pipiens (L.) (Diptera: Culicidae) from Kuwait detected 2 pools with a unique Haemoproteus ( Haemoproteus) sp. (Haemospororida: Haemoproteidae) most likely parasitizing columbiform birds and probably representing contaminated blood meals or aborted infections in mosquitoes. Haemoproteus spp. have been previously reported in Kuwait based on microscopic examination of avian blood smears. This paper reports on molecular detection and subgenus-level identification of a novel Haemoproteus ( Haemoproteus) sp. Mosquitoes are not known as vectors of Haemoproteus ( Haemoproteus) spp., and this agent is most likely transmitted by ornithophilic Hippoboscidae, such as Pseudolynchia canariensis Bequaert. No other haemosporidian parasites were detected.


Assuntos
Doenças das Aves/parasitologia , Columbiformes/parasitologia , Culex/parasitologia , Haemosporida/isolamento & purificação , Infecções Protozoárias em Animais/parasitologia , Animais , Doenças das Aves/epidemiologia , Doenças das Aves/transmissão , Aves , Haemosporida/genética , Kuweit/epidemiologia , Reação em Cadeia da Polimerase/veterinária , Infecções Protozoárias em Animais/epidemiologia , Infecções Protozoárias em Animais/transmissão
10.
Sci Rep ; 7(1): 7993, 2017 08 24.
Artigo em Inglês | MEDLINE | ID: mdl-28839147

RESUMO

The dodo, Raphus cucullatus, a flightless pigeon endemic to Mauritius, became extinct during the 17th century due to anthropogenic activities. Although it was contemporaneous with humans for almost a century, little was recorded about its ecology. Here we present new aspects of the life history of the dodo based on our analysis of its bone histology. We propose that the dodo bred around August and that the rapid growth of the chicks enabled them to reach a robust size before the austral summer or cyclone season. Histological evidence of molting suggests that after summer had passed, molt began in the adults that had just bred; the timing of molt derived from bone histology is also corroborated by historical descriptions of the dodo by mariners. This research represents the only bone histology analysis of the dodo and provides an unprecedented insight into the life history of this iconic bird.


Assuntos
Osso e Ossos/ultraestrutura , Columbiformes/fisiologia , Extinção Biológica , Animais , Cruzamento , Columbiformes/anatomia & histologia , Columbiformes/classificação , Muda , Estações do Ano
11.
Zoology (Jena) ; 122: 58-62, 2017 06.
Artigo em Inglês | MEDLINE | ID: mdl-28363806

RESUMO

In mammals, insulin primarily lowers plasma glucose (PGlu) by increasing its uptake into tissues. Studies have also shown that insulin lowers PGlu in mammals by modulating glomerular filtration rate (GFR). Birds have naturally high PGlu and, although insulin administration significantly decreases glucose concentrations, birds are resistant to insulin-mediated glucose uptake into tissues. Since prior work has not examined the effects of insulin on GFR in birds, the purpose of the present study was to assess whether insulin can augment renal glucose excretion and thereby lower PGlu. Therefore, the hypothesis of the present study was that insulin lowers PGlu in birds by augmenting GFR, as estimated by inulin clearance (CIn). Adult mourning doves (Zenaida macroura) were used as experimental animals. Doves were anesthetized and the brachial vein was cannulated for administration of [14C]-inulin and insulin and the brachial artery was cannulated for blood collections. Ureteral urine was collected via a catheter inserted into the cloaca. Ten minutes following administration of exogenous insulin (400µg/kg body mass, i.v.) plasma glucose was significantly decreased (p=0.0003). Twenty minutes following insulin administration, increases in GFR (p=0.016) were observed along with decreases in urine glucose concentrations (p=0.008), glucose excretion (p=0.028), and the fractional excretion of glucose (p=0.003). Urine flow rate (p=0.051) also tended to increase after administration of insulin. These data demonstrate a significant role for insulin in modulating GFR in mourning doves, which may in part explain the lower PGlu measured following insulin administration.


Assuntos
Glicemia , Columbiformes/metabolismo , Glucose/metabolismo , Insulina/farmacologia , Animais , Glicemia/efeitos dos fármacos , Taxa de Filtração Glomerular/efeitos dos fármacos , Taxa de Filtração Glomerular/fisiologia , Insulina/administração & dosagem , Inulina
12.
Vector Borne Zoonotic Dis ; 16(12): 752-757, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27827557

RESUMO

Wild birds may play an important role in maintaining and transmitting Salmonella. Their ability to travel large distances and their proximity to human habitations could make them a vehicle for bridging Salmonella from wild and domestic animals to humans. To determine the potential public health risk presented by urban birds, we investigated the prevalence of Salmonella among great-tailed grackles (Quiscalus mexicanus) and other cohabiting urban bird species. Fecal samples were collected from 114 birds communally roosting in parking lots of retail locations in Brazos County, Texas, from February through July of 2015. Great-tailed grackles and European starlings (Sturnus vulgaris) were the predominant species sampled. Standard bacteriologic culture methods were used to isolate Salmonella from samples, and isolates were characterized by serotyping and antimicrobial susceptibility testing. Overall, 1.8% (2/114) of samples were confirmed positive for Salmonella. Both positive birds were great-tailed grackles sampled in June, yielding a 2.6% (2/76) apparent prevalence among this species. Isolates were serotyped as Salmonella Typhimurium and found to be pan-susceptible based on the National Antimicrobial Resistance Monitoring System (NARMS) panel of antimicrobial agents. The occurrence of Salmonella in great-tailed grackles represents a potential threat to public health, particularly considering their population size and tendency to congregate near human establishments such as grocery stores.


Assuntos
Doenças das Aves/microbiologia , Columbiformes , Passeriformes , Salmonelose Animal/microbiologia , Salmonella/isolamento & purificação , Animais , Doenças das Aves/epidemiologia , Fezes/microbiologia , Feminino , Masculino , Salmonella/classificação , Salmonelose Animal/epidemiologia , Texas/epidemiologia
13.
Environ Sci Pollut Res Int ; 23(24): 25224-25231, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27687758

RESUMO

Birds have the potential to be considered valuable bioindicators of the quality of ecosystems and the environmental impact of pollutants. The aims of this study were to determine the micronuclei frequency and other nuclear abnormalities in erythrocytes by analyzing a wild bird community from central Monte desert (Argentina) and to clarify if there were any differences among certain species. Frequencies of nuclear abnormalities were determined in 73 wild birds belonging to 17 species and two orders (Passeriformes and Columbiformes). A high proportion of individuals, 90.4 and 80.9 %, had erythrocytes with micronuclei and nuclear buds, respectively. Notched nuclei, binucleated cells, nuclear tails, and nucleoplasmic bridges were also recorded. Certain species appeared to be more informative than others with regard to the possibility of being used as bioindicators of genetic damage. Saltator aurantiirostris and Columbina picui were the only species that showed significantly different frequencies of nuclear alterations, in comparison with the other species. The frequencies here presented are the first reported for these bird species from the orders Passeriformes and Columbiformes. This research supports the notion that the use of these biomarkers could be effectively applied to evaluate spontaneous or induced genetic instability in wild birds.


Assuntos
Animais Selvagens/genética , Columbiformes/genética , Micronúcleos com Defeito Cromossômico , Passeriformes/genética , Animais , Argentina , Núcleo Celular , Ecossistema , Monitoramento Ambiental , Eritrócitos/citologia , Testes para Micronúcleos , Valores de Referência
14.
Mitochondrial DNA A DNA Mapp Seq Anal ; 27(3): 2165-6, 2016 05.
Artigo em Inglês | MEDLINE | ID: mdl-25431823

RESUMO

The complete mitochondrial genome of Columba janthina janthina was sequenced and its total length was 17,469 bp, containing 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs and 1 non-coding control region (D-loop). The A+T content of the overall base composition of H-strand were 54.46% (30.38% A, 24.08% T, 32.00% C and 13.54% G). The arrangement of all genes was identical to the typical mitochondrial genomes of pigeon. Within the control region, conserved sequences were identified in three domains. These results provide basic information for phylogenetic analyses of pigeon, especially Columbiformes species.


Assuntos
Columbidae/genética , Genoma Mitocondrial/genética , Animais , Composição de Bases/genética , Sequência de Bases/genética , Columbiformes/genética , DNA Mitocondrial/genética , Ordem dos Genes , Genes Mitocondriais/genética , Genoma/genética , Filogenia , Análise de Sequência de DNA/métodos , Sequenciamento Completo do Genoma/métodos
15.
J Wildl Dis ; 52(1): 159-63, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26540336

RESUMO

West Nile virus (WNV) in the Americas is thought to be transported at large spatial scales by migratory birds and locally spread and amplified by resident birds. Local processes, including interspecific interactions and dominance of passerine species recognized as competent reservoirs, may boost infection and maintain endemic cycles. Change in species composition has been recognized as an important driver for infection dynamics. Due to migration and changes in species diversity and composition in wintering grounds, changes in infection prevalence are expected. To these changes, we used PCR to estimate the prevalence of WNV in wild resident birds during the dry and rainy seasons of 2012 in Yucatan, Mexico. Serum samples were obtained from 104 wild birds, belonging to six orders and 35 species. We detected WNV in 14 resident birds, representing 11 species and three orders. Prevalences by order was Passeriformes (27%), Columbiformes (6%), and Piciformes (33%). Resident birds positive to WNV from Yucatan may be indicative of local virus circulation and evidence of past virus transmission activity.


Assuntos
Doenças das Aves/epidemiologia , Columbiformes , Passeriformes , Febre do Nilo Ocidental/veterinária , Migração Animal , Animais , Anticorpos Antivirais/sangue , Doenças das Aves/transmissão , Aves , Reservatórios de Doenças , Ecossistema , Doenças Endêmicas/veterinária , México/epidemiologia , Prevalência , RNA Viral/sangue , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Estações do Ano , Febre do Nilo Ocidental/epidemiologia , Febre do Nilo Ocidental/transmissão , Vírus do Nilo Ocidental/genética , Vírus do Nilo Ocidental/imunologia
16.
Br J Hist Sci ; 48(3): 387-408, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26256311

RESUMO

This paper explores the assimilation of the flightless dodo into early modern natural history. The dodo was first described by Dutch sailors landing on Mauritius in 1598, and became extinct in the 1680s or 1690s. Despite this brief period of encounter, the bird was a popular subject in natural-history works and a range of other genres. The dodo will be used here as a counterexample to the historical narratives of taxonomic crisis and abrupt shifts in natural history caused by exotic creatures coming to Europe. Though this bird had a bizarre form, early modern naturalists integrated the dodo and other flightless birds through several levels of conceptual categorization, including the geographical, morphological and symbolic. Naturalists such as Charles L'Ecluse produced a set of typical descriptive tropes that helped make up the European dodo. These long-lived images were used for a variety of symbolic purposes, demonstrated by the depiction of the Dutch East India enterprise in Willem Piso's 1658 publication. The case of the dodo shows that, far from there being a dramatic shift away from emblematics in the seventeenth century, the implicit symbolic roles attributed to exotic beasts by naturalists constructing them from scant information and specimens remained integral to natural history.


Assuntos
Columbiformes , Animais , Comércio/história , Europa (Continente) , História do Século XVI , História do Século XVII , Maurício , História Natural/história
17.
Ecohealth ; 11(4): 544-63, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24947738

RESUMO

The significance of chlamydiosis as a cause of mortality in wild passerines (Order Passeriformes), and the role of these birds as a potential source of zoonotic Chlamydia psittaci infection, is unknown. We reviewed wild bird mortality incidents (2005-2011). Where species composition or post-mortem findings were indicative of chlamydiosis, we examined archived tissues for C. psittaci infection using PCR and ArrayTube Microarray assays. Twenty-one of 40 birds tested positive: 8 dunnocks (Prunella modularis), 7 great tits (Parus major), 3 blue tits (Cyanistes caeruleus), 2 collared doves (Streptopelia decaocto, Order Columbiformes), and 1 robin (Erithacus rubecula). Chlamydia psittaci genotype A was identified in all positive passerines and in a further three dunnocks and three robins diagnosed with chlamydiosis from a previous study. Two collared doves had genotype E. Ten of the 21 C. psittaci-positive birds identified in the current study had histological lesions consistent with chlamydiosis and co-localizing Chlamydia spp. antigens on immunohistochemistry. Our results indicate that chlamydiosis may be a more common disease of British passerines than was previously recognized. Wild passerines may be a source of C. psittaci zoonotic infection, and people should be advised to take appropriate hygiene precautions when handling bird feeders or wild birds.


Assuntos
Doenças das Aves/epidemiologia , Chlamydophila psittaci/genética , Chlamydophila psittaci/isolamento & purificação , Columbiformes/microbiologia , Passeriformes/microbiologia , Animais , Genótipo , Reação em Cadeia da Polimerase , Estudos Retrospectivos , Reino Unido/epidemiologia
18.
J Avian Med Surg ; 28(1): 50-6, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24881154

RESUMO

An unknown-age, adult female ring-necked dove (Streptopelia risoria) was presented with an ulcerated mass on the medial side of the right tibiotarsus. Radiographs revealed severe boney lysis with proliferative periosteal reaction. Surgical amputation was performed at the level of the mid femur and histopathologic examination of the mass identified an osteosarcoma. At the 6-month recheck, the bird was in good condition with no evidence of tumor regrowth or metastasis; however, at 8 months, the dove was found dead. On necropsy, a large mass was present in the coelomic cavity invading the left pulmonary parenchyma. Histopathologic examination indicated a spindle cell sarcoma. Immunohistochemical staining for osteocalcin and osteonectin was performed on the confirmed osteosarcoma in the tibiotarsus and the spindle cell sarcoma mass. Results indicated positive intracytoplasmic immunoreactivity for osteocalcin and osteonectin in the confirmed osteosarcoma neoplasm. Very rare positive cytoplasmic immunoreactivity occurred in the spindle cell sarcoma.


Assuntos
Doenças das Aves/patologia , Neoplasias Ósseas/veterinária , Columbiformes , Neoplasias Pulmonares/veterinária , Osteossarcoma/veterinária , Animais , Neoplasias Ósseas/patologia , Evolução Fatal , Feminino , Membro Posterior/patologia , Neoplasias Pulmonares/secundário , Osteossarcoma/patologia
19.
Infect Genet Evol ; 20: 215-24, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23999544

RESUMO

Wild birds are considered as a natural reservoir of Newcastle disease virus (NDV). However, there is no information about genotype IX NDV from wild birds, especially from Columbiformes. In this study, two genotype IX NDV viruses were isolated from wild birds. One was from Eurasian Blackbird, while the other was from Spotted-necked dove. After purification by plaque technique, complete genomes of both viruses were sequenced. Phylogenetic analysis of partial fusion (F) gene and complete genome indicated both strains belonged to genotype IX. Based on intracerebral pathogenicity index (ICPI), the virus from Eurasian Blackbird was velogenic virus, while the strain from Spotted-necked dove was lentogenic virus. However, both strains showed one of velogenic cleavage sites. In addition, the strain from Eurasian Blackbird showed greater replication ability and generated larger fusion foci in vitro than that of strain from Spotted-necked dove. Comparing all the corresponding protein sequences of both strains, there were only 9 different amino acid residues between them. Furthermore, after analysis of these differences, the information about lentogenic NDV with multi-basic cleavage site was presented.


Assuntos
Columbiformes/virologia , Doença de Newcastle/virologia , Vírus da Doença de Newcastle/classificação , Vírus da Doença de Newcastle/patogenicidade , Sequência de Aminoácidos , Animais , Animais Selvagens/virologia , Sequência de Bases , Galinhas/imunologia , Galinhas/virologia , China , Genoma Viral/genética , Imunização , Doença de Newcastle/prevenção & controle , Vírus da Doença de Newcastle/genética , Nucleoproteínas/genética , Filogenia , Doenças das Aves Domésticas/imunologia , Doenças das Aves Domésticas/virologia , Alinhamento de Sequência , Análise de Sequência de RNA/veterinária , Proteínas Virais de Fusão/genética , Proteínas Virais/genética , Vacinas Virais/imunologia
20.
Conserv Biol ; 27(6): 1478-80, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23992554

RESUMO

The Dodo was last sighted on the inshore island of Ile d'Ambre in 1662, nearly 25 years after the previous sighting on the mainland of Mauritius. It has been suggested that its survival on the inshore island is representative of the refuge effect. Understanding what constitutes significant persistence is fundamental to conservation. I tested the refuge-effect hypothesis for the persistence of the Dodo (Raphus cucullatus) on an inshore island beyond that of the mainland population. For a location to be considered a refuge, most current definitions suggest that both spatial and temporal isolation from the cause of disturbance are required. These results suggest the island was not a refuge for the Dodo because the sighting in 1662 was not temporally isolated from that of the mainland sightings. Furthermore, with only approximately 350 m separating Ile d'Ambre from the mainland of Mauritius, it is unlikely this population of Dodos was spatially isolated. Hipótesis del Efecto Refugio y la Desaparición del Dodo.


Assuntos
Columbiformes/fisiologia , Conservação dos Recursos Naturais , Extinção Biológica , Animais , Ecossistema , Ilhas , Maurício , Isolamento Reprodutivo
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